/*
 *  Copyright 2007 Blandware (http://www.blandware.com)
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */
package com.blandware.atleap.webapp.action.core.sequenceItem;

import com.blandware.atleap.common.Constants;
import com.blandware.atleap.model.core.BaseObject;
import com.blandware.atleap.model.core.ContentResource;
import com.blandware.atleap.model.core.Localizable;
import com.blandware.atleap.model.core.Page;
import com.blandware.atleap.model.core.Sequence;
import com.blandware.atleap.model.core.SequenceItem;
import com.blandware.atleap.service.core.SequenceManager;
import com.blandware.atleap.service.exception.BeanNotFoundException;
import com.blandware.atleap.service.exception.OwnerNotFoundException;
import com.blandware.atleap.webapp.action.core.BaseAction;
import com.blandware.atleap.webapp.form.core.SequenceItemForm;
import com.blandware.atleap.webapp.util.core.WebappConstants;
import com.blandware.atleap.webapp.util.core.WebappUtil;
import org.apache.commons.validator.GenericValidator;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.action.ActionMessage;
import org.apache.struts.action.ActionMessages;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

/**
 * <p>Creates sequence item.
 * </p>
 * <p><a href="CreateSequenceItemAction.java.html"><i>View Source</i></a></p>
 * <p/>
 *
 * @author Roman Puchkovskiy <a href="mailto:roman.puchkovskiy@blandware.com">
 *         &lt;roman.puchkovskiy@blandware.com&gt;</a>
 * @version : $Revision: 1.4 $ : 2007/12/17 13:38:25 $
 * @struts.action path="/core/sequenceItem/create"
 * name="sequenceItemForm"
 * scope="request"
 * input="inputForward"
 * validate="true"
 * roles="core-sequenceItem-create"
 * @struts.action-forward name="inputForward"
 * path=".core.sequenceItem.create"
 * @struts.action-forward name="listSequenceItems"
 * path="/core/sequenceItem/list.do"
 * redirect="false"
 * @struts.action-forward name="callCreateSequenceItem"
 * path="/core/sequenceItem/callCreate.do"
 * redirect="false"
 * @struts.action-forward name="listSequences"
 * path="/core/sequence/list.do"
 * redirect="false"
 * @struts.action-forward name="unsatisfiable"
 * path="/core/sequenceItem/list.do"
 */
public final class CreateSequenceItemAction extends BaseAction {
	/**
	 * @param mapping  The ActionMapping used to select this instance
	 * @param form     The optional ActionForm bean for this request (if any)
	 * @param request  The HTTP request we are proceeding
	 * @param response The HTTP response we are creating
	 * @return an ActionForward instance describing where and how
	 *         control should be forwarded, or null if response
	 *         has already been completed
	 */
	public ActionForward execute(ActionMapping mapping, ActionForm form,
	                             HttpServletRequest request, HttpServletResponse response) throws Exception {

        HttpSession session = request.getSession();
        SequenceItemForm sequenceItemForm = (SequenceItemForm) form;
        String requestUrl = (String) session.getAttribute(WebappConstants.REDIRECT_URL_KEY);

        Long sequenceId;
        if ( !GenericValidator.isBlankOrNull(sequenceItemForm.getSequenceId()) ) {
            sequenceId = Long.valueOf(sequenceItemForm.getSequenceId());
        } else if ( session.getAttribute(WebappConstants.SEQUENCE_ID_KEY) != null ) {
            sequenceId = (Long) session.getAttribute(WebappConstants.SEQUENCE_ID_KEY);
        } else {
            if ( log.isWarnEnabled() ) {
                log.warn("Missing sequence ID. Returning to index...");
            }
            if ( !GenericValidator.isBlankOrNull(requestUrl) ) {
                session.removeAttribute(WebappConstants.REDIRECT_URL_KEY);
                return new ActionForward(requestUrl, true);
            }
            return mapping.findForward("admin");
        }

        if ( !isCancelled(request) ) {

			SequenceManager sequenceManager = (SequenceManager) getBean(Constants.SEQUENCE_MANAGER_BEAN);

            Sequence sequence;
            sequence = sequenceManager.retrieveSequence(sequenceId);

            if ( sequence == null ) {
				// sequence not found. it might has already been deleted
				ActionMessages errors = new ActionMessages();
				errors.add("sequenceNotFound", new ActionMessage("core.sequence.errors.notFound"));
				saveErrors(request, errors);
                if ( !GenericValidator.isBlankOrNull(requestUrl) ) {
                    session.removeAttribute(WebappConstants.REDIRECT_URL_KEY);
                    return new ActionForward(requestUrl, true);
                }
                return mapping.findForward("listSequences");
			}

            BaseObject object = WebappUtil.lookupObject(sequenceItemForm.getObjectIdentifier(),
                    servlet.getServletContext(), request.getContextPath());
            Page page = null;
            ContentResource contentResource = null;
            boolean foundObject;

            byte sequenceType = sequence.getType();
            // trying to find specified object
            switch (sequenceType) {
            case Sequence.TYPE_PAGES:
                if (object instanceof Page) {
                    page = (Page) object;
                }
                foundObject = page != null;
                break;
            case Sequence.TYPE_RESOURCES:
                if (object instanceof ContentResource) {
                    contentResource = (ContentResource) object;
                }
                foundObject = contentResource != null;
                break;
            default:
                throw new IllegalArgumentException("Unknown sequence type: " + sequenceType);
            }

            if (!foundObject) {
				// object not found. it might has already been deleted
				ActionMessages errors = new ActionMessages();
                String key;
                switch (sequenceType) {
                case Sequence.TYPE_PAGES:
                    key = "core.page.errors.notFound";
                    break;
                case Sequence.TYPE_RESOURCES:
                    key = "core.contentResource.errors.notFound";
                    break;
                default:
                    throw new IllegalArgumentException("Unknown sequence type: " + sequenceType);
                }
                errors.add("objectNotFound", new ActionMessage(key));
				saveErrors(request, errors);
                saveToken(request);
                return mapping.getInputForward();
            }

            Localizable owner = sequence.getOwner();
            String ownerInfo = WebappUtil.getLocalizableInfo(owner, request);
            session.setAttribute(WebappConstants.OWNER_INFO_KEY, ownerInfo);

            SequenceItem sequenceItem = new SequenceItem();

            try {
                switch (sequenceType) {
                case Sequence.TYPE_PAGES:
                    sequenceManager.createPageSequenceItem(sequenceItem, sequenceId, page.getId());
                    break;
                case Sequence.TYPE_RESOURCES:
                    sequenceManager.createContentResourceSequenceItem(sequenceItem, sequenceId, contentResource.getId());
                    break;
                default:
                    throw new IllegalArgumentException("Unknown sequence type: " + sequenceType);
                }
            } catch ( OwnerNotFoundException e ) {
				ActionMessages errors = new ActionMessages();
				errors.add("ownerNotFound", new ActionMessage("core.sequence.errors.ownerNotFound"));
				saveErrors(request, errors);
                if ( !GenericValidator.isBlankOrNull(requestUrl) ) {
                    session.removeAttribute(WebappConstants.REDIRECT_URL_KEY);
                    return new ActionForward(requestUrl, true);
                }
                return mapping.findForward("listSequences");
			} catch ( BeanNotFoundException e ) {
				// object not found. it might has already been deleted
				ActionMessages errors = new ActionMessages();
                String key;
                switch (sequenceType) {
                case Sequence.TYPE_PAGES:
                    key = "core.page.errors.notFound";
                    break;
                case Sequence.TYPE_RESOURCES:
                    key = "core.contentResource.errors.notFound";
                    break;
                default:
                    throw new IllegalArgumentException("Unknown sequence type: " + sequenceType);
                }
                errors.add("objectNotFound", new ActionMessage(key));
				saveErrors(request, errors);
                saveToken(request);
                return mapping.getInputForward();
			}
        }

        if ( !GenericValidator.isBlankOrNull(requestUrl) ) {
            session.removeAttribute(WebappConstants.REDIRECT_URL_KEY);
            return new ActionForward(requestUrl, true);
        }
        return mapping.findForward("listSequenceItems");
	}
}
